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| author | Rob Landley <rob@landley.net> | 2005-07-31 04:25:00 +0000 |
|---|---|---|
| committer | Rob Landley <rob@landley.net> | 2005-07-31 04:25:00 +0000 |
| commit | c7a3e1be8fe22b271193840a5b6bdde93da147ae (patch) | |
| tree | 4a4f40c2424b42f18e609bae3357adca2a31eac9 /docs | |
| parent | e70aa9de7ebd8674bfeed74e6cd5c3d6d377c721 (diff) | |
| download | busybox-w32-c7a3e1be8fe22b271193840a5b6bdde93da147ae.tar.gz busybox-w32-c7a3e1be8fe22b271193840a5b6bdde93da147ae.tar.bz2 busybox-w32-c7a3e1be8fe22b271193840a5b6bdde93da147ae.zip | |
Fix "nm --size-sort" on the busybox binary and document how to make it work.
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/busybox.net/FAQ.html | 87 |
1 files changed, 26 insertions, 61 deletions
diff --git a/docs/busybox.net/FAQ.html b/docs/busybox.net/FAQ.html index a2264f9fe..a2d20bf5c 100644 --- a/docs/busybox.net/FAQ.html +++ b/docs/busybox.net/FAQ.html | |||
| @@ -246,68 +246,33 @@ have additions to this FAQ document, we would love to add them, | |||
| 246 | trust PayPal... | 246 | trust PayPal... |
| 247 | 247 | ||
| 248 | <hr /> | 248 | <hr /> |
| 249 | <p> | ||
| 250 | <h2><a name="optimize">I want to make busybox even smaller, how do I go about it?</a></h2> | ||
| 251 | <p> | ||
| 252 | To conserve bytes it's good to know where they're being used, and the | ||
| 253 | size of the final executable isn't always a reliable indicator of | ||
| 254 | the size of the components (since various structures are rounded up, | ||
| 255 | so a small change may not even be visible by itself, but many small | ||
| 256 | savings add up). | ||
| 257 | </p> | ||
| 258 | <p> | ||
| 259 | To examine a busybox binary with an eye to saving bytes, build an | ||
| 260 | optimized debug version and run the "nm" command against it, like so: | ||
| 261 | </p> | ||
| 262 | <p> | ||
| 263 | make clean && make STRIPCMD=/bin/true && nm --size-sort busybox | ||
| 264 | </p> | ||
| 265 | <p> | ||
| 266 | This gives a list of symbols and the amount of space allocated for | ||
| 267 | each one, sorted by size. (Note: do not enable CONFIG_DEBUG for this, | ||
| 268 | as that disables compiler optimization which is great for running gdb | ||
| 269 | but misleading when trying to figure out how much space each component | ||
| 270 | is really using under normal circumstances.) | ||
| 271 | </p> | ||
| 272 | <hr /> | ||
| 273 | |||
| 274 | |||
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